North Korea has invited President Donald Trump via letter to meet their leader Kim Jong Un according to a senior US official.

On Thursday a South Korean delegation came to the White House to brief officials on its most recent talks with North Korea — the most significant talks between the two countries in more than a decade.

The South Korean officials visiting the White House on Thursday talked to Trump, a person familiar with the matter said.

U.S. presidents for the past 30 years have been brokering deals with North Korea but never before has the leader of the free world met face-to-face with the North Korean leader. The meeting on denuclearizing North Korea would have to take place in South Korea.

The senior US official said North Korea has offered to suspend their nuclear missile testing alongside their invitation for talks. The official also said there are no plans to suspend the upcoming planned military exercises with South Korea.

It’s not clear if the South Koreans spoke to the President before or after his surprise pop-in to the White House briefing room.